<!DOCTYPE html>
PASS if there is no red visible.
<div style="background: white; width: 100px; height: 100px; position: relative; left: 0.7px;">
    <div style="background: white; width: 70px; height: 70px; position: relative; transform: translateZ(0);">
        <div style="background: red; width: 40px; height: 40px; position: fixed;">
            <!-- Because the first div is snapped up to (1,1), this div will start with a -->
            <!-- paint offset of (-0.3,-0.3) which will be added to (0.7,0.7) to get -->
            <!-- (0.4,0.4) which rounds down to (0,0) and obscures the red divs. -->
            <div style="width: 40px; height: 40px; background: white; position: relative; left: 0.7px;"></div>
        </div>
    </div>
</div>
